The Collaborative International Dictionary of English v.0.48:

Olio \O"li*o\ ([=o]"l[i^]*[-o] or [=o]l"y[-o]), n. [Sp. olla a
   round earthen pot, a dish of boiled or stewed meat, fr. L.
   olla a pot, dish. Cf. Olla, Olla-podrida.]
   1. A dish of stewed meat of different kinds. [Obs.]
      [1913 Webster]

            Besides a good olio, the dishes were trifling.
                                                  --Evelyn.
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   2. A mixture; a medley. --Dryden.
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   3. (Mus.) A collection of miscellaneous pieces.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "olio":
   Irish stew, all sorts, assemblage, assortment, bouillabaisse, brew,
   broad spectrum, chowder, conglomeration, curry, etuvee, fricassee,
   gallimaufry, goulash, hash, hodgepodge, hotchpot, hotchpotch,
   jumble, magpie, mash, meat stew, medley, melange, mess,
   mingle-mangle, miscellany, mishmash, mix, mixed bag, odds and ends,
   olla, olla podrida, omnium-gatherum, oyster stew, paella,
   pasticcio, pastiche, patchwork, potpourri, ragout, salad,
   salmagundi, sauce, scramble, stew, what you will